[INFO] fetching crate rohit_grep 0.1.0...
[INFO] building rohit_grep-0.1.0 against try#4987e9d4227139400384ab59296ffee3b0fb1183 for pr-146237-2
[INFO] extracting crate rohit_grep 0.1.0 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate rohit_grep 0.1.0
[INFO] finished tweaking crates.io crate rohit_grep 0.1.0
[INFO] tweaked toml for crates.io crate rohit_grep 0.1.0 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rohit_grep 0.1.0 on toolchain 4987e9d4227139400384ab59296ffee3b0fb1183
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate rohit_grep 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 86809237ae3f5b8eb794552618632b6468fabf5a75aacf9066100a0feec09be8
[INFO] running `Command { std: "docker" "start" "-a" "86809237ae3f5b8eb794552618632b6468fabf5a75aacf9066100a0feec09be8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "86809237ae3f5b8eb794552618632b6468fabf5a75aacf9066100a0feec09be8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "86809237ae3f5b8eb794552618632b6468fabf5a75aacf9066100a0feec09be8", kill_on_drop: false }`
[INFO] [stdout] 86809237ae3f5b8eb794552618632b6468fabf5a75aacf9066100a0feec09be8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3b5d49576e4898947d18a0e076596ca3d18973fbdfcc3cd8e0b141a695c7ee89
[INFO] running `Command { std: "docker" "start" "-a" "3b5d49576e4898947d18a0e076596ca3d18973fbdfcc3cd8e0b141a695c7ee89", kill_on_drop: false }`
[INFO] [stderr]    Compiling aho-corasick v1.1.3
[INFO] [stderr]    Compiling crossbeam-utils v0.8.20
[INFO] [stderr]    Compiling libc v0.2.158
[INFO] [stderr]    Compiling log v0.4.22
[INFO] [stderr]    Compiling predicates-core v1.0.8
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling rustix v0.38.37
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]    Compiling difflib v0.4.0
[INFO] [stderr]    Compiling termtree v0.4.1
[INFO] [stderr]    Compiling normalize-line-endings v0.3.0
[INFO] [stderr]    Compiling portable-atomic v1.7.0
[INFO] [stderr]    Compiling predicates-tree v1.0.11
[INFO] [stderr]    Compiling assert_cmd v2.0.16
[INFO] [stderr]    Compiling once_cell v1.20.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.18
[INFO] [stderr]    Compiling unicode-width v0.1.13
[INFO] [stderr]    Compiling clap_derive v4.5.13
[INFO] [stderr]    Compiling float-cmp v0.9.0
[INFO] [stderr]    Compiling crossbeam-deque v0.8.5
[INFO] [stderr]    Compiling console v0.15.8
[INFO] [stderr]    Compiling wait-timeout v0.2.0
[INFO] [stderr]    Compiling clap_builder v4.5.17
[INFO] [stderr]    Compiling regex-automata v0.4.7
[INFO] [stderr]    Compiling number_prefix v0.4.0
[INFO] [stderr]    Compiling tempfile v3.12.0
[INFO] [stderr]    Compiling indicatif v0.17.8
[INFO] [stderr]    Compiling clap v4.5.17
[INFO] [stderr]    Compiling bstr v1.10.0
[INFO] [stderr]    Compiling regex v1.10.6
[INFO] [stderr]    Compiling globset v0.4.15
[INFO] [stderr]    Compiling predicates v3.1.2
[INFO] [stderr]    Compiling ignore v0.4.23
[INFO] [stderr]    Compiling globwalk v0.9.1
[INFO] [stderr]    Compiling assert_fs v1.1.2
[INFO] [stderr]    Compiling rohit_grep v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/lib.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 |             writeln!(writer, "{}", line);
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 4 |             let _ = writeln!(writer, "{}", line);
[INFO] [stdout]   |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 31.11s
[INFO] running `Command { std: "docker" "inspect" "3b5d49576e4898947d18a0e076596ca3d18973fbdfcc3cd8e0b141a695c7ee89", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b5d49576e4898947d18a0e076596ca3d18973fbdfcc3cd8e0b141a695c7ee89", kill_on_drop: false }`
[INFO] [stdout] 3b5d49576e4898947d18a0e076596ca3d18973fbdfcc3cd8e0b141a695c7ee89
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 42e17894612f9a303011946651aa8c244e2d7b67902546239cfbe88282b086fd
[INFO] running `Command { std: "docker" "start" "-a" "42e17894612f9a303011946651aa8c244e2d7b67902546239cfbe88282b086fd", kill_on_drop: false }`
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/lib.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 |             writeln!(writer, "{}", line);
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 4 |             let _ = writeln!(writer, "{}", line);
[INFO] [stdout]   |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rohit_grep v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/lib.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 |             writeln!(writer, "{}", line);
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 4 |             let _ = writeln!(writer, "{}", line);
[INFO] [stdout]   |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.46s
[INFO] running `Command { std: "docker" "inspect" "42e17894612f9a303011946651aa8c244e2d7b67902546239cfbe88282b086fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "42e17894612f9a303011946651aa8c244e2d7b67902546239cfbe88282b086fd", kill_on_drop: false }`
[INFO] [stdout] 42e17894612f9a303011946651aa8c244e2d7b67902546239cfbe88282b086fd